topic Re: What is wrong with my connection? in Switching

What is wrong with my connection?

bmrash — Thu, 07 Mar 2019 18:27:43 GMT

I have a router that has two T1s going into it to provide network connectivity at a remote site. One of the serial connections works fine, while other shows that it is down, and shows only an amber light. Here are the configurations of those ports:

THIS IS THE INTERFACE THAT DOES WORK

interface Serial0/0/1:1
ip address [omitted]

ip pim sparse-dense-mode

load-interval 30

auto qos voip trust

service-policy output AutoQoS-Policy-Trust

Serial0/0/1:1 is up, line protocol is up

Hardware is DSX1

Internet address is [omitted]

MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,

reliability 255/255, txload 4/255, rxload 7/255

Encapsulation HDLC, crc 16, loopback not set

Keepalive set (10 sec)

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 25504

Queueing strategy: Class-based queueing

Output queue: 0/1000/0 (size/max total/drops)

30 second input rate 43000 bits/sec, 31 packets/sec

30 second output rate 27000 bits/sec, 49 packets/sec

73044938 packets input, 3272617538 bytes, 0 no buffer

Received 793500 broadcasts (4086001 IP multicasts)

69122 runts, 852 giants, 0 throttles

86734 input errors, 85876 CRC, 0 frame, 0 overrun, 0 ignored, 1449 abort

73110921 packets output, 1989216531 bytes, 0 underruns

0 output errors, 0 collisions, 4 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

19 carrier transitions

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        CISCO2911/K9          FTX1632AKS6

Technology Package License Information for Module:'c2900'

-----------------------------------------------------------------
Technology    Technology-package           Technology-package
              Current       Type           Next reboot
------------------------------------------------------------------
ipbase        ipbasek9      Permanent      ipbasek9
security      None          None           None
uc            uck9          Permanent      uck9
data          None          None           None

Configuration register is 0x2102

Serial0/0/1:1 is up, line protocol is up

THIS IS THE INTERFACE THAT IS NOT WORKING

interface Serial0/0/0:1
ip address [omitted]

load-interval 30
auto qos voip trust
service-policy output AutoQoS-Policy-Trust

Serial0/0/0:1 is down, line protocol is down
Hardware is DSX1
Internet address is [omitted]

MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,
     reliability 240/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 3w6d, output 3w6d, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6221
Queueing strategy: Class-based queueing
Output queue: 0/1000/0 (size/max total/drops)
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
     34290781 packets input, 3755121313 bytes, 0 no buffer
     Received 482586 broadcasts (894326 IP multicasts)
     8493 runts, 7 giants, 0 throttles
     10416 input errors, 10409 CRC, 0 frame, 0 overrun, 0 ignored, 620 abort
     32395697 packets output, 218182603 bytes, 0 underruns
     0 output errors, 0 collisions, 9 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
     42 carrier transitions

Output of the Show Version command to provide information about the router:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        CISCO2911/K9          FTX1632AKS6

Technology Package License Information for Module:'c2900'

Configuration register is 0x2102

If you need any more information please let me know. Any help is appreciated I have looked over this configuration repeatedly, but I have yet to figure out the issue.

What is wrong with my connection?

John Blakley — Fri, 07 Dec 2012 17:23:29 GMT

Have you contacted the provider? I see a lot of CRCs on both interfaces. Can you clear counters to see if you're still getting errors? If so, I'd contact the provider and possibly change cables....

HTH,
John

*** Please rate all useful posts ***

What is wrong with my connection?

bmrash — Fri, 07 Dec 2012 19:04:03 GMT

We had the T1 plugged into another device and it worked fine. We put it into this router and it won't work. The cabling is all brand new and we had a couple different people confirm that it's wired correctly. The other T1 (S0/0/1:1) works fine, that's where the confusion is right now.

What is wrong with my connection?

graham smart — Fri, 07 Dec 2012 19:53:58 GMT

Any useful output from a show controllers ?

What is wrong with my connection?

bmrash — Fri, 07 Dec 2012 20:04:05 GMT

Here is the "show controllers" output for the interfaces:

T1 0/0/0 is down.

Applique type is Channelized T1

Cablelength is long 0db

Transmitter is sending remote alarm.

Receiver is getting AIS.

alarm-trigger is not set

Soaking time: 3, Clearance time: 10

AIS State:Failure LOS State:Clear LOF State:Failure

Version info FPGA Rev: 08121917, FPGA Type: PRK4

Framing is ESF, Line Code is B8ZS, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (385 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 385 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 385 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

0 Slip Secs, 86400 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 86400 Unavail Secs

T1 0/0/1 is up.

Applique type is Channelized T1

Cablelength is long 0db

No alarms detected.

alarm-trigger is not set

Soaking time: 3, Clearance time: 10

AIS State:Clear LOS State:Clear LOF State:Clear

Version info FPGA Rev: 08121917, FPGA Type: PRK4

Framing is ESF, Line Code is B8ZS, Clock Source is Line.

CRC Threshold is 320. Reported from firmware is 320.

Data in current interval (385 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

296 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

296 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Total Data (last 24 hours)

0 Line Code Violations, 0 Path Code Violations,

66403 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

66403 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Re: What is wrong with my connection?

Leo Laohoo — Sat, 08 Dec 2012 00:07:06 GMT

Serial0/0/0:1 is down, line protocol is down

Hardware is DSX1

Internet address is [omitted]

MTU 1500 bytes, BW 1536 Kbit/sec, DLY 20000 usec,

reliability 240/255, txload 1/255, rxload 1/255

It's a Layer 1 issue. Contact your provider and tell them to run a 4-hour Bit Error Rate test (BER test).

In an ideal condition, "reliability" should be 255/255 (both values) and nothing less.

  AIS State:Failure LOS State:Clear  LOF State:Failure

RED alarm.

Re: What is wrong with my connection?

graham smart — Sat, 08 Dec 2012 13:44:22 GMT

As pointed out ( Red alarm )

This may help:

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00801069ff.shtml

Transmit Sending Remote Alarm (Red)

A Red alarm is declared when the channel service unit (CSU) cannot synchronize with the framing pattern on the T1 line.

To correct the transmitter from sending remote alarms, complete the following steps:

Ensure the framing format configured on the port matches the framing format of the line. If not, change the framing format on the controller to match the format of the line.
Check the settings at the remote end and ensure that they match your port settings.
Contact your Service Provider.

You could possibly try just for the hell of it....

To correct Rx AIS errors, complete the following steps:

Check the show controller t1 [slot/port] output to see if the framing format configured on the port matches the framing format of the line. If not, change the framing format on the controller to match the line.
To change the framing format, use the framing {SF | ESF} command in controller configuration mode. For example:
```
maui-nas-03#configure terminalEnter configuration commands, one per line. End with CNTL/Z. 
maui-nas-03(config)#controller t1 0maui-nas-03(config-controlle)#framing esf 
```

Re:What is wrong with my connection?

Durga Prasad M.S — Sat, 08 Dec 2012 16:38:24 GMT

Try swapping you transmit and receive pairs.
Ask your provider if they are doing framing or the link is unframed.

Rgds/dp

Sent from Cisco Technical Support Android App

Re:What is wrong with my connection?

Milan Rai — Sun, 09 Dec 2012 04:09:22 GMT

Brett is that working fine now?????

Some times a simple solution is being neglated.......Have you tried....shutting down the interface and No shut ......command????

Just go for that once..........I have faced port being hang sometimes..........So....one restart....can be the best.....solution for this problem.........Plz let me know if that works.......

What is wrong with my connection?

Leo Laohoo — Sun, 09 Dec 2012 04:35:46 GMT

Some times a simple solution is being neglated.......Have you tried....shutting down the interface and No shut ......command????
Just go for that once..........I have faced port being hang sometimes..........So....one restart....can be the best.....solution for this problem.........Plz let me know if that works.......

As far as I know, when you have a RED Alarm on your Frame Relay connection, a shut/no shut isn't a solution.

Re:What is wrong with my connection?

Milan Rai — Mon, 10 Dec 2012 03:55:07 GMT

you never know leolaohoo....once i faced problem with my bgp peer.....everything was ok......Port was Up and Protocol was also UP.........but still there was problem on the peer..........after lots of troubleshooting........what i though of doing was to shut the interface and un shut it again.......after that it worked fine..............

You never know.......what happens to machines????

What is wrong with my connection?

bmrash — Mon, 10 Dec 2012 17:36:28 GMT

I have tried a shut/no shut already. It is a basic troubleshooting technique and one of the first that I tried. Thanks for the suggestion.

What is wrong with my connection?

graham smart — Mon, 10 Dec 2012 18:46:50 GMT

Right..

Well it seems you are now down to two options ( one )

Check the settings at the remote end and ensure that they match your port settings.
Contact your Service Provider.

Both will need your ISP to actually help you.

-Graham
Please note: My comments are simply suggestions. I cannot be held liable for any loss of data, life or marbles due to following my instructions.

Live chat software for websites. Increase sales.

What is wrong with my connection?

Leo Laohoo — Tue, 11 Dec 2012 03:58:18 GMT

Hi Brett,

You're getting a RED alarm. This is a service provider-issue with their equipment and they need to address this.